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Finding the Fourth Proportional to 66,428,942.80, 99,643,414.20 and 61,327,109.20

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Solution

The fourth proportional to 66,428,942.80, 99,643,414.20 and 61,327,109.20 is: 91,990,663.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428,942.80 : 99,643,414.20 = 61,327,109.20 : x
  2. Step 2: Convert to fraction form
    66,428,942.80/99,643,414.20 = 61,327,109.20/x
  3. Step 3: Cross multiply
    66,428,942.80x = 99,643,414.20 × 61,327,109.20
  4. Step 4: Simplify right side
    66,428,942.80x = 6,110,842,543,704,231
  5. Step 5: Solve for x
    x = 6,110,842,543,704,231/66,428,942.80
  6. Step 6: Final answer
    x = 91,990,663.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.